[Bug] Spring Cloud Gateway plugin causes traceIds duplicated with different requests #13443

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Apache SkyWalking Component

Java Agent (apache/skywalking-java)

What happened

With Spring Cloud(version 2024.0.0) and Spring Cloud Gateway(version 4.2.0), Spring Cloud Gateway will dispatch requests to other services. What we expect is that every request that dispatched by gateway should have unique traceId in the downstream micro-services. But, we found theses traceIds are duplicated when the concurrency of requests is very high.

We just log all these request's headers and bodies (micro-service just uses servlet container, which is tomcat). We can conclude that thread http-nio-48084-exec-9 and thread http-nio-48084-exec-5 have same traceId and same http header "sw8", while these two reuqests are different outer requests that have different request bodies.

What you expected to happen

I suspect that it is caused by this patch #747. This problem is only happened when concurrency is heavy.

How to reproduce

With Spring Cloud version 2024.0.0+, Spring Cloud Gateway(webflux) and one service with tomcat and concurrency is heavy.

Anything else

No response

Are you willing to submit a pull request to fix on your own?

• Yes I am willing to submit a pull request on my own!

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